Membrane effects of 2,4-dichlorophenoxyacetic acid in motor cells of Mimosa pudica L
| Autor: | Gabriel Roblin, Janine Bonmort, Christelle Moyen |
|---|---|
| Přispěvatelé: | Laboratoire Chrono-environnement ( LCE ), Université Bourgogne Franche-Comté ( UBFC ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Franche-Comté ( UFC ), Transport des assimilats ( TA ), Université de Poitiers-Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Chrono-environnement - CNRS - UBFC (UMR 6249) (LCE), Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Transport des assimilats (TA), Université de Poitiers-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2007 |
| Předmět: |
0106 biological sciences
Mimosa 2 4-Dichlorophenoxyacetic acid Physiology ATPase Turgor pressure Plant Science ATPase activity 4-dichlorophenoxyacetic acid 01 natural sciences Membrane Potentials Cell membrane 03 medical and health sciences chemistry.chemical_compound Osmoregulation Cell Movement Auxin Genetics medicine Glycosides Membrane potential 030304 developmental biology chemistry.chemical_classification Mimosa pudica 0303 health sciences Indoleacetic Acids biology Cell Membrane Proton flux Hydrogen-Ion Concentration Hyperpolarization (biology) Plant Leaves Kinetics medicine.anatomical_structure chemistry Biochemistry Seedlings Fusicoccin biology.protein 2 4-Dichlorophenoxyacetic Acid 010606 plant biology & botany |
| Zdroj: | Plant Physiology and Biochemistry Plant Physiology and Biochemistry, Elsevier, 2007, 45, pp.420-426. 〈10.1016/j.plaphy.2007.03.030〉 Plant Physiology and Biochemistry, Elsevier, 2007, 45, pp.420-426. ⟨10.1016/j.plaphy.2007.03.030⟩ |
| ISSN: | 0981-9428 |
| DOI: | 10.1016/j.plaphy.2007.03.030 |
| Popis: | International audience; 2,4-dichlorophenoxyacetic acid applied to excised leaves of Mimosa pudica L. inhibited in a dose-dependent manner the shock-induced pulvinar movement. This inhibition was negatively correlated with the amount of [14C] 2,4-dichlorophenoxyacetic acid present in the vicinity of the motor cells. Although 2,4-dichlorophenoxyacetic acid is a weak acid, its greatest physiological efficiency was obtained with pH values close to neutrality. This observation opens the question of its mode of action which may be through external signaling or following internal transport by a specific anionic form transporter. The effect was related to molecular structure since 2,4-dichlorophenoxyacetic acid > 3,4- dichlorophenoxyacetic acid > 2,3-dichlorophenoxyacetic acid. An essential target of 2,4-dichlorophenoxyacetic acid action lies at the plasmalemma as indicated by the induced hyperpolarization of the cell membrane. Compared to indole-3-acetic acid and fusicoccin, it induced a complex effect on Hþ fluxes. Applied to plasma membrane vesicles purified from motor organs, 2,4-dichlorophenoxyacetic acid enhanced proton pumping, but, unlike fusicoccin, it did not increase the Hþ-ATPase catalytic activity in our experimental conditions. Taken together, the data suggest that 2,4-dichlorophenoxyacetic acid acts on cell turgor variation and the concomittant ion migration, in particular Kþ, by a mechanism involving specific steps compared to indole-3-acetic acid and fusicoccin. |
| Databáze: | OpenAIRE |
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